Not until ________ the Internet ________ that the Chinese sailors were rescued by the European Union Task Force.
| A．did I surf; did I know | B．did I surf; I knew |
| C．I surfed; did I know | D．I surfed; I had know |
The father and the son entered the tiger area _______ two doors were open at the time.
Suddenly five tigers appeared, one of which killed the father.
| A．there | B．which | C．its | D．whose |
Gilbert wasn’t ______ the time this morning, so he was late for school.
| A．involved in | B．particular about | C．linked to | D．aware of |
Weshouldconsidertheprofessor’s advice _______ our school library provide more books on popular science.
| A．that | B．when | C．which | D．where |
If Newton lived today, he would be surprised by what _______ in science and technology.
| A．had discovered | B．had been discovered |
| C．has discovered | D．has been discovered |
Pip agreed to give some piano lessons to the girl_______ for a generous gift from her mother.
| A．in nature | B．in return | C．in turn | D．in time |